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 Stromberg Carlson Model 4a17
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 Return to top of page · Post #: 1 · Written at 4:31:44 PM on 29 August 2023.
Bowler's Gravatar
 Bowler
 Location: Bongaree, QLD
 Member since 26 October 2018
 Member #: 2308
 Postcount: 89

Hi All, does anyone have a circuit diagram for a 4a17 using the 6sa8 as converter. bowler
 
 Return to top of page · Post #: 2 · Written at 8:15:52 PM on 29 August 2023.
Ian Robertson's Gravatar
 Ian Robertson
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2476

I assume you mean the 6SA7?

https://frank.pocnet.net/sheets/201/6/6SA7.pdf
 
 Return to top of page · Post #: 3 · Written at 10:18:55 PM on 29 August 2023.
Marcc's avatar
 Marcc
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5389

4A17 is a reflexed set 1947 horrid 6A8, EBF35 metalised Philips, 6V6 and rectifier 5Y3. Use 600v filter caps.
Do not remove the Philips tube by dragging it out by the envelope; The metallisation is its shield and you are liable to break the wire to pin 1 ground.


 
 Return to top of page · Post #: 4 · Written at 9:01:19 AM on 30 August 2023.
Bowler's Gravatar
 Bowler
 Location: Bongaree, QLD
 Member since 26 October 2018
 Member #: 2308
 Postcount: 89

Sorry my mistake the valve is indeed a 6sa7. Bowler
 
 Return to top of page · Post #: 5 · Written at 9:22:08 PM on 31 August 2023.
Ian Robertson's Gravatar
 Ian Robertson
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2476

The 6SA7 was probably a substitute due to immediate post-war shortages.
It is the same as a 6A8 except the G3 connection is on the base.
The link will give you the pinouts, otherwise the circuit is probably the same as with the 6A8

Marc is right about those metalised Philips valves. Don't pull or twist the red bulb!!
It someone else has, you can fix the connection with a silver or gold paint pen.
 
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